Wear-resistant polyurethane thermal insulation steel pipe

Abstract

The utility model relates to a polyurethane heat preservation steel pipe not prone to abrasion, and belongs to the technical field of polyurethane heat preservation steel pipes. The connecting pipe comprises an outer pipe, an inner pipe and a connecting layer, the inner pipe is coaxially arranged on the inner side of the outer pipe; the connecting layer is arranged between the outer pipe and the inner pipe; the connecting layer comprises a plurality of positioning strips and six positioning blocks; the positioning strips are evenly distributed in a circumferential mode, every two adjacent positioning strips are rotationally connected end to end, and the adjusting range of the included angle between every two adjacent positioning strips is 60-120 degrees. And the inner pipe is movably connected with the connecting layer, so that the inner pipe is quickly fixed and detached. The sealing device has the advantages of being stable in control effect, good in sealing performance and easy to operate in actual construction, and effectively improves production efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of polyurethane heat-insulated steel pipes, and particularly relates to a polyurethane heat-insulated steel pipe that is not easily worn. Background Art

[0002] On medium and small-diameter hot crude oil or heating pipelines, in order to reduce heat dissipation from the pipeline to the soil, a heat-insulating composite layer is added outside the pipeline. The commonly used heat-insulating material is rigid polyurethane foam plastic, and the applicable temperature is -185 to 120 °C. This material is soft in texture. To improve its strength, a layer of high-density polyethylene is applied outside the heat-insulating layer to form a composite material structure to prevent groundwater from seeping into the heat-insulating layer. The outer surface of the steel pipe is treated by shot blasting and rust removal, and the inner surface of the outer protective pipe is treated by corona to improve the bonding performance of the heat-insulated pipe. Polyurethane heat-insulated steel pipes can reduce project costs, reduce heat loss during transportation, and effectively save energy. Polyurethane materials have good anti-corrosion and insulation properties and a long service life.

[0003] The Chinese patent with the publication number CN220749477U solves the above technical problems, and the technical solution disclosed in the patent document is as follows: A polyurethane heat-insulated steel pipe includes a steel pipe body. An insulating layer is arranged inside the steel pipe body, and an inner anti-corrosion layer is arranged inside the insulating layer. An elastic layer is arranged outside the steel pipe body, and a heat-insulating layer is arranged outside the elastic layer. The heat-insulating layer includes an inner layer pipe, a sandwich pipe arranged outside the inner layer pipe, and an outer layer pipe arranged outside the sandwich pipe. A plurality of reinforcing ribs are arranged between the inner layer pipe and the sandwich pipe and between the sandwich pipe and the outer layer pipe. Polyurethane foam is filled between the plurality of reinforcing ribs, and an outer anti-corrosion layer is arranged outside the outer layer pipe. The utility model adopts a polyurethane heat-insulated steel pipe with the above structure. By arranging an elastic layer, the phenomenon that the structure of the heat-insulating layer is damaged due to the high-temperature expansion of the steel pipe is prevented; at the same time, reinforcing ribs are arranged to ensure the stability of the heat-insulating layer structure. Although the patent realizes the heat-insulated transportation of liquid and gas in the pipe as a whole and has good anti-corrosion and wear resistance, it cannot maintain and replace the easily worn inner pipe, and has limited service life and high maintenance costs. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a polyurethane heat-insulated steel pipe that is not easily worn to solve the problems raised in the above background art.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0006] A polyurethane heat-insulated steel pipe that is not easily worn includes an outer pipe, an inner pipe, and a connecting layer.

[0007] With the above technical solution, in this solution, the inner tube is coaxially arranged inside the outer tube; the connecting layer is arranged between the outer tube and the inner tube; the connecting layer includes a number of positioning bars and six positioning blocks; the positioning bars are evenly distributed in a circle, and the adjacent two positioning bars are rotatably connected at the head and tail, and the included angle between the two can be adjusted within the range of 60° to 120°. By setting the inner tube to be movably connected with the connecting layer, the fixing and disassembly of the inner tube are realized, and the actual operation is relatively convenient.

[0008] A further improvement of the technical solution of the present utility model lies in that: the outer tube includes a heat insulation layer, a buffer layer, a shell, threaded holes and bolts.

[0009] With the above technical solution, in this solution, the heat insulation layer is arranged outside the connecting layer, the buffer layer is arranged outside the heat insulation layer, and the shell is arranged outside the buffer layer; the connecting layer, the heat insulation layer, the buffer layer and the shell are concentric circle structures. Six threaded holes are opened at both ends of the outer tube, and the threaded holes are evenly distributed in a circle; the bolts correspond to the threaded holes one by one and are in threaded fit, and each threaded hole penetrates through the shell, the buffer layer and the heat insulation layer, and the lower end of the bolt installed in the threaded hole is rotatably connected with the positioning block, and the positioning bars are installed on the positioning block. When the bolt moves downward, it drives the positioning block to move downward, and the two positioning bars installed on the positioning block will immediately rotate to both sides; on the contrary, when the positioning block moves upward with the bolt, the two positioning bars installed on the positioning block will immediately rotate towards the angular bisector.

[0010] A further improvement of the technical solution of the present utility model lies in that: the inner tube includes corundum porcelain, a transition layer and a steel pipe body.

[0011] With the above technical solution, in this solution, the transition layer is arranged outside the corundum porcelain, and the steel pipe body is arranged outside the transition layer; the outer diameter of the inner tube is the same as the inner diameter of the outer tube. The corundum porcelain is connected to the steel pipe body through the transition layer, and the corundum porcelain, the transition layer and the steel pipe body form a composite pipe. The corundum porcelain has high hardness, wear resistance and corrosion resistance, and the composite pipe gives full play to the advantages of high strength, good toughness and impact resistance of the steel pipe, and at the same time overcomes the problems of low hardness and poor wear resistance of the steel pipe.

[0012] A further improvement of the technical solution of the present utility model lies in that: the connecting layer further includes an elastic layer.

[0013] With the above technical solution, in this solution, the elastic layer is arranged outside the steel pipe body, and its outer side is connected to the lower end of the positioning bar. When the bolt moves upward, the two positioning bars installed on the positioning block will immediately rotate towards the angular bisector, and the lower end of the positioning bar applies pressure to the elastic layer to realize the clamping and fixing of the inner tube. When the bolt moves downward, the two positioning bars installed on the positioning block will immediately rotate to both sides, releasing the pressure applied by the positioning bar to the elastic layer and releasing the fixing of the inner tube. The inner tube is locked by six bolts evenly distributed in a circle, realizing the rapid installation and disassembly of the inner tube. This patent has the advantages of stable control effect, good sealing performance and easy operation, and can improve production efficiency.

[0014] A further improvement of the technical solution of the present utility model lies in that: the heat insulation layer is filled with polyurethane foam material.

[0015] By adopting the above technical solution, in this solution, the polyurethane foam material has excellent heat insulation performance and waterproof performance, which can maintain the temperature of the gas and liquid transported in the pipe and at the same time insulate the external environment. The rubber band indirectly supports the outer shell, improving the structural strength of the outer shell.

[0016] A further improvement of the technical solution of the present utility model lies in that: the outer shell adopts a high-density polyethylene protective layer.

[0017] By adopting the above technical solution, in this solution, the high-density polyethylene material has high wear resistance and corrosion resistance and a long service life.

[0018] Due to the adoption of the above technical solution, the technical progress achieved by the present utility model compared with the prior art is as follows:

[0019] 1. The present utility model includes a connection layer, and the connection layer includes a plurality of positioning bars, six positioning blocks and an elastic layer; the positioning bars are evenly distributed in a circle, and two adjacent positioning bars are rotatably connected, and the rotation angle between the two is in a V shape. The elastic layer is arranged outside the steel pipe body, and its outer side is connected to the lower end of the positioning bar. The inner pipe is movably connected to the connection layer, and six threaded holes are provided at both ends of the outer pipe, and the threaded holes are evenly distributed in a circle; the bolts correspond to the threaded holes one by one and are in threaded fit, and each threaded hole penetrates through the outer pipe, and the lower end of the bolt installed in the threaded hole is fixedly connected to the positioning block. When the bolt moves downward, it drives the positioning block to move downward, and the V-shaped positioning bar rotatably connected to the positioning block immediately opens to both sides, applying pressure to the elastic layer to clamp and fix the inner pipe. On the contrary, when the positioning block moves upward with the bolt, the V-shaped positioning bar rotatably connected to the positioning block randomly tightens towards the middle, releasing the pressure on the elastic layer. When the bolt moves upward, the fixation of the inner pipe is released. The present utility model locks the inner pipe through six bolts evenly distributed in a circle, realizing the rapid installation and disassembly of the inner pipe. This patent has the advantages of stable control effect, good sealing performance and easy operation, and can improve production efficiency.

[0020] 2. The present utility model provides an inner pipe, which includes corundum porcelain, a transition layer and a steel pipe body; the corundum porcelain is connected to the steel pipe body through the transition layer, and the corundum porcelain, the transition layer and the steel pipe body form a composite pipe. The corundum porcelain has high hardness, wear resistance and corrosion resistance. The present utility model gives full play to the advantages of high strength, good toughness and impact resistance of the steel pipe by forming a composite pipe, and at the same time overcomes the problems of low hardness and poor wear resistance of the steel pipe.

[0021] 3. The thermal insulation layer of the present utility model is filled with polyurethane foam material; a plurality of rubber ribs evenly distributed in a circle are installed in the buffer layer, and the outer shell is made of high-density polyethylene protective layer. The polyurethane foam material has excellent thermal insulation performance and waterproof performance, which can maintain the temperature of the gas and liquid transported in the pipe and insulate the external environment at the same time. The rubber ribs indirectly support the outer shell and improve the structural strength of the outer shell. The high-density polyethylene material has high wear resistance and corrosion resistance and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 It is a schematic view of the appearance of a polyurethane heat-insulating steel pipe that is not easily worn according to the present utility model;

[0024] Figure 2 It is a schematic structural view of a polyurethane heat-insulating steel pipe that is not easily worn according to the present utility model;

[0025] Figure 3 It is a schematic cross-sectional structural view of a polyurethane heat-insulating steel pipe that is not easily worn according to the present utility model;

[0026] Figure 4 It is Figure 3 an enlarged schematic view of the structure at A in

[0027] Figure 5 It is Figure 3 an enlarged schematic view of the structure at B in

[0028] Figure 6 It is Figure 3 an enlarged schematic view of the structure at C in

[0029] In the figure: 1. Outer pipe; 2. Inner pipe; 3. Connection layer; 11. Thermal insulation layer; 12. Buffer layer; 13. Outer shell; 14. Threaded hole; 15. Bolt; 16. Anticorrosive coating; 21. Corundum porcelain; 22. Transition layer; 23. Steel pipe body; 31. Positioning strip; 32. Positioning block; 33. Elastic layer; 121. Rubber rib; 122. Cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The present utility model will be further described in detail below with reference to the embodiments:

[0031] Embodiment 1

[0032] As Figure 1-3 shown, the present utility model provides a polyurethane heat-insulating steel pipe that is not easily worn, including an outer pipe 1, an inner pipe 2 and a connection layer 3.

[0033] In this embodiment, the inner tube 2 is coaxially arranged inside the outer tube 1; the connecting layer 3 is arranged between the outer tube 1 and the inner tube 2; by arranging the inner tube 2 to be movably connected to the connecting layer 3, the fixing and disassembly of the inner tube 2 are realized, and the operation is convenient.

[0034] The connecting layer 3 includes a plurality of positioning strips 31 and six positioning blocks 32; the positioning strips 31 are evenly distributed in a circle, and the heads and tails of two adjacent positioning strips 31 are rotatably connected, and the included angle between the two can be adjusted within a range of 60 to 120 degrees. In this embodiment, the positioning strips 31 are rectangular strips made of metal, and in other embodiments, they can also be C-shaped strips made of polyethylene. The outer tube 1 includes a heat insulation layer 11, a buffer layer 12, a housing 13, threaded holes 14 and bolts 15; the heat insulation layer 11 is arranged outside the connecting layer 3, the buffer layer 12 is arranged outside the heat insulation layer 11, and the housing 13 is arranged outside the buffer layer 12; the connecting layer 3, the heat insulation layer 11, the buffer layer 12 and the housing 13 are concentric circle structures. The heat insulation layer 11 is filled with polyurethane foam material; a plurality of rubber ribs 121 evenly distributed in a circle are installed on the buffer layer 12, and the filling material in the cavity 122 of the buffer layer 12 is rubber. The polyurethane foam material has excellent heat insulation performance and waterproof performance, realizes the maintenance of the temperature of the gas and liquid transported in the pipe, and at the same time insulates the external environment. The rubber ribs 121 indirectly support the housing 13 and improve the structural strength of the housing 13.

[0035] Six threaded holes 14 are opened at both ends of the outer tube 1, and the threaded holes 14 are evenly distributed in a circle; the bolts 15 correspond to the threaded holes 14 one by one and are in threaded fit. Each threaded hole 14 penetrates through the housing 13, the buffer layer 12, and the heat insulation layer 11, and the lower end of the bolt 15 installed in the threaded hole 14 is fixedly connected to the positioning block 32. In this embodiment, the bolt 15 is a hexagonal bolt 15, and in other embodiments, it can also be an eye bolt 15 or a turnbuckle bolt 15. The bolts 15 and the threaded holes 14 need to be sprayed with a metal anti-corrosion coating to be isolated from the surrounding corrosive medium to prevent corrosion. A bearing is arranged in the positioning block 32, and the lower end of the bolt 15 is rotatably connected to the bearing in the positioning block 32, and the positioning strip 31 is installed on the positioning block 32. When the bolt 15 moves downward, the positioning block 32 is driven to move downward, and the two positioning strips 31 installed on the positioning block 32 immediately rotate to both sides; conversely, when the positioning block 32 moves upward with the bolt 15, the two positioning strips 31 installed on the positioning block 32 immediately rotate towards the angle bisector.

[0036] As Figure 4As shown, in this embodiment, preferably, the connecting layer 3 further includes an elastic layer 33; the elastic layer 33 is made of rubber with a large coefficient of friction. The elastic layer 33 is disposed outside the steel pipe body 23, and the lower ends of the positioning strips 31 are arranged on its outer side. The outer diameter of the connecting layer 3 is equal to the inner diameter of the outer pipe 1. When the bolt 15 moves upward, the two positioning strips 31 mounted on the positioning block 32 rotate towards the midline of the included angle immediately to apply pressure to the elastic layer 33, and the inner pipe 2 is clamped and fixed through the frictional action between the rubber and the steel pipe body 23. When the bolt 15 moves downward, the two positioning strips 31 mounted on the positioning block 32 rotate towards both sides immediately to release the frictional force and release the fixation of the inner pipe 2. The inner pipe 2 is locked by six bolts 15 evenly distributed in a circle, realizing the rapid installation and disassembly of the inner pipe 2. This structure has the advantages of stable control effect, good sealing performance and easy operation. By replacing the easily worn inner pipe 2, the service life of the heat-insulating steel pipe is extended and the maintenance cost is reduced.

[0037] As Figure 5 shown, preferably, the inner pipe 2 includes corundum porcelain 21, a transition layer 22 and a steel pipe body 23; the transition layer 22 is disposed outside the corundum porcelain 21, and the steel pipe body 23 is disposed outside the transition layer 22. The outer side of the steel pipe body 23 is polished to enhance the frictional action between it and the elastic layer 33. The outer diameter of the inner pipe 2 is the same as the inner diameter of the connecting layer 3. The corundum porcelain 21 is connected to the steel pipe body 23 through the transition layer 22, and the corundum porcelain 21, the transition layer 22 and the steel pipe body 23 form a composite pipe. The corundum porcelain 21 has high hardness, wear resistance and corrosion resistance. The composite pipe gives full play to the advantages of high strength, good toughness and impact resistance of the steel pipe, and at the same time overcomes the problems of low hardness and poor wear resistance of the steel pipe.

[0038] As Figure 6 shown, preferably, the outer shell 13 is made of a high-density polyethylene protective layer, and the connecting layer 3, the heat-insulating layer 11, the buffer layer 12 and the outer shell 13 are concentric circle structures. The outer side of the outer shell 13 is sprayed with an epoxy anti-corrosion coating to improve the wear resistance and corrosion resistance of the high-density polyethylene material and extend the service life of the outer shell 13.

[0039] Next, the working principle of this non-easily worn polyurethane heat-insulating steel pipe will be specifically described.

[0040] As Figure 1-6As shown, the inner pipe 2 is placed inside the connection layer 3, and its position is adjusted by rotating the bolt 15 in the threaded hole 14. When the bolt 15 moves, the positioning block 32 moves along with it. When the bolt 15 moves upward, the two positioning bars 31 installed on the positioning block 32 rotate towards the angular bisector and apply pressure to the elastic layer 33, and the clamping and fixing of the inner pipe 2 are achieved through the frictional action between the rubber and the steel pipe body 23. When the bolt 15 moves downward, the two positioning bars 31 installed on the positioning block 32 rotate towards both sides to release the frictional force and release the fixing of the inner pipe 2. The inner pipe 2 is locked by six bolts 15 evenly distributed in a circle, realizing the rapid installation and disassembly of the inner pipe 2. This structure has the advantages of stable control effect, good sealing performance, and easy operation. By replacing the easily worn inner pipe 2, the service life of the heat-insulating steel pipe is extended and the maintenance cost is reduced.

[0041] In addition, the heat-insulating layer 11 is filled with polyurethane foam material; a plurality of rubber ribs 121 evenly distributed in a circle are installed in the buffer layer 12, and the filler in the cavity 122 of the buffer layer 12 is rubber. The polyurethane foam material exhibits excellent heat-insulating performance and waterproof performance, realizing the maintenance of the temperature of the gas and liquid transported inside the pipe, and at the same time insulating the external environment. The rubber ribs 121 indirectly support the outer shell 13, improving the structural strength of the outer shell 13. The corundum porcelain 21 is connected to the steel pipe body 23 through the transition layer 22, and the corundum porcelain 21, the transition layer 22, and the steel pipe body 23 form a composite pipe. The composite pipe fully utilizes the advantages of high strength, good toughness, and impact resistance of the steel pipe, and at the same time overcomes the problems of low hardness and poor wear resistance of the steel pipe. The outer shell 13 adopts a high-density polyethylene protective layer, and an epoxy anti-corrosion coating is sprayed on the outside, improving the wear resistance and corrosion resistance of the high-density polyethylene material and extending the service life of the outer shell 13.

[0042] The above has generally described the present invention in detail. However, based on the present invention, some modifications or improvements can be made, which are obvious to those of ordinary skill in the technical field. Therefore, the modifications or improvements made without departing from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A polyurethane insulated steel pipe that is not easy to wear, characterized in that: include: Outer tube (1); An inner tube (2) is coaxially arranged inside the outer tube (1); A connecting layer (3) is arranged between the outer tube (1) and the inner tube (2); the connecting layer (3) comprises a plurality of positioning strips (31) and six positioning blocks (32); the positioning strips (31) are evenly distributed on the circumference, two adjacent positioning strips (31) are connected end to end by rotation, and the angle between the two can be adjusted within a range of 60 to 120 degrees.

2. The wear-resistant polyurethane insulated steel pipe according to claim 1, characterized in that: The outer tube (1) comprises a heat-insulating layer (11), a buffer layer (12), an outer shell (13), threaded holes (14), bolts (15) and an epoxy anti-corrosion coating (16); the heat-insulating layer (11) is arranged outside the connecting layer (3), the buffer layer (12) is arranged outside the heat-insulating layer (11), and the outer shell (13) is arranged outside the buffer layer (12); six threaded holes (14) are provided at both ends of the outer tube (1), and the threaded holes (14) are evenly distributed around the circumference; the bolts (15) correspond to the threaded holes (14) one by one and are threadedly matched, and the positioning block (32) is rotatably connected to one end of the bolt (15).

3. The wear-resistant polyurethane insulated steel pipe according to claim 1, characterized in that: The inner tube (2) comprises corundum porcelain (21), a transition layer (22) and a steel tube body (23); the transition layer is arranged outside the corundum porcelain (21), and the steel tube body (23) is arranged outside the transition layer (22); the outer diameter of the inner tube (2) is the same as the inner diameter of the outer tube (1).

4. The wear-resistant polyurethane insulated steel pipe according to claim 3, characterized in that: The connection layer (3) further comprises an elastic layer (33); the elastic layer (33) is arranged outside the steel pipe body (23), and its outer side is connected to the lower end of the positioning strip (31).

5. The wear-resistant polyurethane insulated steel pipe according to claim 2, characterized in that: The heat-insulating layer (11) is filled with polyurethane foam material; the buffer layer (12) is provided with a plurality of rubber ribs (121) evenly distributed in a circumference, and the cavity (122) of the buffer layer (12) is filled with rubber.

6. The wear-resistant polyurethane insulated steel pipe according to claim 2, characterized in that: The outer shell (13) adopts a high-density polyethylene protective layer, and the connecting layer (3), the heat-insulating layer (11), the buffer layer (12) and the outer shell (13) are a circle-centered structure.

7. The wear-resistant polyurethane insulated steel pipe according to claim 3, characterized in that: The corundum porcelain (21) is connected to the steel pipe body (23) via the transition layer (22).

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